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Finding the Fourth Proportional to 1,449.78, 1,999.19 and 1,240.65

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Solution

The fourth proportional to 1,449.78, 1,999.19 and 1,240.65 is: 1,710.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.78 : 1,999.19 = 1,240.65 : x
  2. Step 2: Convert to fraction form
    1,449.78/1,999.19 = 1,240.65/x
  3. Step 3: Cross multiply
    1,449.78x = 1,999.19 × 1,240.65
  4. Step 4: Simplify right side
    1,449.78x = 2,480,278.87
  5. Step 5: Solve for x
    x = 2,480,278.87/1,449.78
  6. Step 6: Final answer
    x = 1,710.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.